Oven burner head



April 19, 1932.

H. c. MAUL' OVEN BURNER HEAD Filed April 20, 1931 INVENTOR BY 6'.b14441- ATTORNEY Patented Apr. 19, 1932 UNITED sTArEs PATENT OFFICEHENRY O. HAUL, DETROIT, HIOHTGAN, ABSIGNOE TO DETROIT IICHIGAN STOVECOMPANY, 01' DETROIT, MICHIGAN, A OQRPORATION OI MICHIGAN om some Thisinvention relates to gas range constructions and more particularly toimprove-. ments in the feeding of gas to the oven and valve, the latterbeing provided with a thermal bar which controls the size of the orificein the valve. A vertical pipe leads from the orifice and conducts gasfrom the valve to the horizontal mixing tube of the oven and broilerburner.

In constructions as at present known, the pipe which leads from thethermal valve to the mixing tube is a vertical pipe having a horizontalportion which opens into the horizontal portion of the burner, thelatter having a horizontally opening shutter controlled mixing tubemouth on the terminal of its horizontal ortion. A serious objection toranges of t is type has been found. When the manual control on thethermal valve is moved from high to low, the orifice the thermal valveis made very small, and the gas escaping from the small orifice in thethermal valve loses its pressure in the vertical pipe leading to theburner. Accordingly, when the gas emerges from the horizontal part ofthis pipe into the mixing tube mouth, it has not suflicient velocity toovercome the pressure within the burner due to the heat of the oven andaccordingly the gas coming out of the open end of the pipe does notreach the burner openings to be consumed but instead escapes from themixing tube thru the shutter controlled openings in the mouth, in anunconsumed condition. This condition, as observed in ranges, is commonlycalled a gas leak, when in fact there is no leak at all.

In the construction of the invention, the mixing tube has a dependingvertical portion having a downwardly opening mouth,

and the vertical pipe has an upstanding vertical portion opening iptothe mouth so that the gas rises as it enters the tube. Accordingly, thegas will rise into the tube a considerable distance, regardless of thepressure 0 behind it and will be carried into the burner Applicationfled April :0, 1031. Serial no. 531,441.

by the inflowing air, there being, thus, no escape or leak of unconsumedgases.

An object of this invention, therefore, is a range having a novel formof connection, one which insures the combustion of the gases coming outof the vertical pipe regardless o the gas pressure conditions existent.

other object is a novel form of connec- I tion between the vertical pipeaforementioned and the horizontal part of the burner,

one in which the horizontal part ofthe bumer is provided with adownwardly depending vertical part having'a mixing tube mouth at itsend, mto which the upstanding vertical terminal of the vertical pipe isprO ected, the

pipe having a U bend at its lower end to provide such a verticalupwardly projecting terminal.

Still further objects will readily occur to those skilled in the artupon reference to the following description and the accompanying drawingin which The single figure on the drawing shows in perspective arange'equipped with the novel form of connection above described.

Referring to this figure, it will. be seen that the range includes anoven compartment 10, a broiler compartment 12, a service drawer 14, anda concealing plate 16 behind which is a manifold 17 having cocks whosestems project thru the plate and are provided with handles 18 disposedin front of the plate. A gas supply line 20 comes into the stove fromthe rear thereof, extending along the right side, and is provided with adouble elbow 2224 by means of which it is connected to the manifold 17.The central one of the cooks whose handles are indicated at 18 is theoven burnercock, and it is indicated at 28. This cock may be of anydesired form, and is connected to the manifold on the under partthereof, and has a union fitting leading rearwardly therefrom andconnected to the oven burner supply pipe oven 10 and is provided with ariser 34, leading into and connected to the inlet of the thermallycontrolled valve 36. This valve may be of any suitable form and has athermal bar 38 for automatically controlling the size of the valveorifice and also a setting handle 40'- whose function is well known inthe art. The valve 36 has a part 42 extending into the oven casing andfrom this part depends the vertical pipe 44 which conducts gas to theoven burner 46, the latter being disposed beneath the floor 48 of theoven and having burner holes (not sfhown) preferably located on itsunder surace.

The construction thus far described is more or less conventional andforms no part of the resent invention, which concerns itself mainy withthe form of connection between the vertical pipe 44 and the horizontalburner 46. The connection of the invention includes a U shaped part 52which is connected to the lower extremity of the vertical pipe by meansof the fitting 54 and which has an upstanding or upwardly extending part56 disposed within the conventional shutter controlled mixing tube mouth58 of the mixing tube 60, the latterv connecting to the horizontal part62 of the burner.

As can be readily understood gas entering the pipe 20 goes into themanifold 17 and when the cock 28 is opened, the gas goes thru the pipes32--34, thru the orifice in valve 36 and its part 42, and into the pipe44 from whence it emerges into the conventional mixing tube mouth 58,then going into the mixing tube and into the burner.

In the old constructions where the parts 56 and 60 were horizontal, thegas would escape from the part 56 and then out thru the air openings inthe mixing tube mouth without having been burnt, this being due to thelack of pressure behind the gas at this point when the orifice in thevalve 36 was made very v small.

In the present construction, however, it will be seen that as the gasemerges from the part 56 it tends to rise of its own accord, regardlessof whatever pressure exists behind it, and accordingly gas will find itsway into the mixng tube and consequently into the burner Now havingdescribed the invention and the preferred embodiment thereof, it is tobe understood that the said invention is to be limited, not to thespecific details herein set forth, but only by the scope of the claimswhich follow:

What I claim is:

1. In a gas range, an oven, a broiler compartment, a horizontallydisposed elongated oven burner in the broiler compartment, immediatelybeneath the floor of the oven and provided with a depending verticalmixing tube having a downwardly opening, shutter controlled, mixing tubemouth, a thermally controlled, manually settable valve ona wall of theoven, near the oven ceiling, and a pipe leading from the valve outlet tothe mixing tube mouth, the pipe including a lpprtion passmg by the ovenwhere it will heated by the'oven heat, a portion passing by the mixingtube mouth, and an upstandingyterminal portion opening into the mixingtu mouth.

2. In a gas range, an oven ortion, a broiler portion therebeneath, an aburner plate to one side of'the oven and broiler portions, ahorizontally disposed elongated oven burner in the broiler portion,immediately beneath the floor of the oven and provided with a dependingvertical mixing tube having a downwardly opening; shutter controlledmixing tube mouth, a manifold under the plate near the front of therange, a thermally controlled manually settable valve on a wall of theoven, near the oven ceiling, a pipe leading from the manifold to thevalve inlet, and a pipe leading from the valve outlet to the mixing tubemouth, the latter pipe including a portion passing by the oven where itwill be heated by the oven heat, a portion passing by the mixing tubemouth, and an upstanding terminal portion opening into the mixing tubemouth.

In testimony whereof, I sign this specification.

HENRY C. MAUL.

